Research Of Pressure Calculation Of Horizontal Well In Sebei Gas Field

As the development of well drilling techonology, the exploitation of horizontal well become more popular. This techonology exhibit its huge advantage in mature and marginal reservoir, low permeable reservoir, laminar reservoir. Sebei gas field began to use this technology and SeH1, SeH2, SeH3, SeH4 well, TaiH5-1 and TaiH5-2 began to produce from 2007. The producing rate raise much in these wells. But they also face a lot of problems. Some of these well produce much water, the problem of adaptiveness in different reservoir, the problem of optimization in design for different geology. these problems have some ralationship with wellbore pressure. The purpose of this paper is calculating the pressure in the vertical wellbore through literature search and computer simulation. In order to get a accurately result we divide the calculation into two ways: dry gas&high gas water ratio, low gas water ratio. To deflecting part, we use slope pipeline instead of the deflecting part. through calculating the slope pipeline we obtain our aim of calculating the deflecting part approximlately. We combine the calculation of pressure in vertical pipeline and slope pipeline together. I compare the calculating result and the result we got from well test. Then I analyse the reasons of the error. In the fundemental of the program I analyse the water production, tubing diameter, tubing length, those influent the well pressure in the heel. there is a huge uncertainty in the calculating of pressure in the horizontal wellbore because of the complex of the reservior. I creat the coupling model through literature search and transform it in to a program. Though this program we calculate the pressure distribution in the wellbore in two ways with water or without water. I calculate the pressure in two well with the production data and the geodata. In the fundamental of the program I calculating the pressure in horizontal wellbore in different water producing and different angle of the wellbore. Then sum up the law between them.